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I have seen lately so may cases regarding WD Passport.
Open Disk Management expand the columns and with sniping tool, take a snapshot. Post the image here as an attachment. (Go Advanced - Manage attachments - browse- Upload)

I'm sorry to hear about the problems you are having, I know this could be an extremely unpleasant experience.

Like @Megahertz07 wrote, it will be great if you can upload some screenshots from Disk Management so we can take a look at what exactly is happening with the hard disk. If you have used the drive before than you can try to get the data off by booting with Linux Live CD - hopefully that way the external will appear and you will be able to move the information to another location so it will be safely secured. Here's an Ubuntu KB article with a detailed guide on how to boot up:LiveCD - Community Help Wiki

Other than that, once the data is removed, you can also run a test on it with our diagnostic tool Data Lifeguard Diagnostics and see if any errors or bad sectors will be detected by the software:Support Answers

Hope this helps and let us know how it went. Additionally, feel free to upload some screenshots with the test results as well.

Anyway, now that it shows up on another PC, I would advise that you copy all your data in it to another external drive before you do anything with it on your PC.. ( Do not buy WD Passport and Passport ultra.Those are hardware encrypted.)

I still do not know whether your Passport is a portable drive or a desktop one with a power adapter. Please mention the exact model Number and capacity.

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WD My Passport 0820 - Not Initialized - Data Lifeguard FAILHi,
I have WD My Passport 0820 and it was working without any problem, and it it has been stopped few days ago. I hardly succeeded to remove the security password from it, but I can't open it.
After removing the security password, I found the disk appears in the disk management like this...
...

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